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(b) A commercial cell has a top layer sheet resistivity of 35 ȍ/† and
gives its maximum power output at a voltage of 420 mV and a current
2
density of 28 mA/cm . If the finger spacing is 3 mm, calculate the
fractional power loss owing to lateral current flows in the diffused top
layer.
(c) If the bulk substrate resistivity is 1 ȍ.cm and the substrate is 350 ȝm
thick, estimate the fractional power loss due to current flow in the
substrate.

4.8 Calculate and sketch the upper limit to the spectral sensitivity (short circuit
current/power in incident monochromatic light) as a function of wavelength
for a silicon solar cell.

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